Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Poznan, Poland.
Colloids Surf B Biointerfaces. 2012 Feb 1;90:53-7. doi: 10.1016/j.colsurfb.2011.09.047. Epub 2011 Oct 4.
Eugenol (2-methoxy-4-allyl-phenol) was used as a reducing agent for one-pot synthesis of gold nanoparticles in a mild alkaline aqueous/organic solution at room temperature. In this reaction, eugenol acts also as a stabilizing agent, since it undergoes polymerization upon oxidation. As a result, stable colloids of polyeugenol (PE)-capped gold nanoparticles are formed during the reaction with the average particle size of 44 nm. Moreover, conducting supports, such as ITO glass, are covered by Au/PE composite film when immersed in the reaction medium. The modified ITO shows redox activity assignable to residual quinone moieties of PE with redox couples at a potential range of -0.2 to 0.4V (vs. Ag/AgCl at pH 7.4). Redox properties of Au/PE nanoparticulate films can be exploited for the electrocatalytic oxidation of NADH with over 0.5 V reduction of the reaction overpotential vs. unmodified ITO. Nanoparticulate composite films were characterized by UV-vis spectroscopy, XPS and FT-IR spectroscopy. The characterization revealed structural similarity of the formed PE to lignin.
丁香酚（2-甲氧基-4-丙烯基苯酚）在室温下的弱碱性水/有机溶液中被用作还原一锅法合成金纳米粒子的还原剂。在该反应中，丁香酚也起到了稳定剂的作用，因为它在氧化过程中会发生聚合。结果，在反应过程中形成了稳定的聚丁香酚（PE）封端的金纳米粒子胶体，平均粒径为 44nm。此外，当浸入反应介质中时，ITO 玻璃等导电载体被 Au/PE 复合膜覆盖。修饰后的 ITO 显示出可归因于 PE 的残留醌部分的氧化还原活性，氧化还原对在 -0.2 至 0.4V 的电位范围内（相对于 pH 7.4 时的 Ag/AgCl）。Au/PE 纳米颗粒薄膜的氧化还原性质可用于电化学催化氧化 NADH，与未修饰的 ITO 相比，反应过电位的还原超过 0.5V。纳米颗粒复合膜通过紫外可见光谱、XPS 和 FT-IR 光谱进行了表征。表征结果表明形成的 PE 与木质素具有结构相似性。
